Shuttle-box motion for looms



May 6, 1930- L. LETTMAN, JR 1,757,319

SHUTTLE BOX MOTION FOR LOOMS F-led April 17, 1928 Arm/ver- Patented May 6, 1930 PATENT OFFICE LOUIS LETTI/LAN, JR., OF PATERSON, NEW JERSEY SHUTTLE-BOX MOTION FOR LOOMS Application filed April 17,

This invention relates to that class of shuttle-boX motions for looms which is illustrated, for example, in the Wattie et al. Patent No. 551,104, and its underlying object is to provide simple and reliable means whereby the movements of the vibrator mechanism of boxmotions of this class may be made dependent on hooks ofthe jacquard machine of the loom and special means, such as a dobby, will not 1o be required, nor will there be required any indicator or equivalent intermediary such as characterizes the mechanism ot the Crutchlow Patent No. 1,626,723.

l'n the drawing,

Fig. 1 is a side elevation of the improved borr operating means in place on a loom;

Fig. 2 is a plan with certain rods 15 in section;

Fig. 3 is a section on line 3 3, Fig. 2; and

Fig. 4 a side elevation ot certain parts in Fig. 2.

1n the loom frame l is journaled a suitably driven gear train including the mutilated cylinder gears 2 and transmission gears 3 and 4. Between the cylinder gears is a mutilated gear 5 journaled in a lever 6 ulcrumed in the frame so as to move up or down to bring the vibrator gear 5 into position to be partially turned byone or the other cylinder gear and come to a dwell. To an eccentric point of gear 5 is pivotally connected the vibratorgear connector' 7 which in turn is connected to a bell-crank lever 8 fulcrumed in the frame and having a link 9 pivotally connecting it with the box-lever l() which carries the shuttle box carrying rod 11. The vibrator mechanism including parts 5, 6 and 7, together with the means 8-9 to connect it to the box-lever 10, is duplicated as usual so that lever 10 is supported at two points as shown, whereby in the well known way said lever 1() and hence the boxes may be made to assume four positions; in fact, there are usually two sets of these mechanisms, one for the boxes at each side of the loom, and to this the invention, as illustrated in Figs. 2 and 3, is adapted. 12 is the usual holding pawl normally active on lever 6 to hold the vibrator mechanism up or down, and 13 the cam for clearing the pawl from the lever on every rotation of said cam,

1928. Serial No. 270,678.

which turns with one of the cylinder gears. The weight of each vibrator mechanism, which normally holds it depressed or positioned tor actuation by the lower cylinder gear, is in part offset by a. weighted lever 14 to which lever 6 is connected by a rod 15.

Actuating means, whereby the vibrator mechanism is moved from its depressed to its elevated position so as to be actuated by the upper cylinder gear, is `afforded by the parts 2, 3 and 4 and the following elements: On the lower gear 2 is a cam 16 which elevates a gravity-depressed lever 17 having pivot-ally connected therewith an upstanding block 18 forming an impact member; the pivotal connection between the lever and member is formed and said member made to move up and down substantially rectilineally by providing a notch 18`in the under side of said member, whereby it thus straddles the lever (F ig. 3), and extending through said member and lever a pivot member 19 held in the former by a set screw 20 and having an up turned end 19n which is seated in a vertical groove 18b in said member and is guided in a hole in a bracket 21 fixed to the loom trame.`

Each vibrator mechanism is adapted to be lifted from its normal or depressed position to position to be actuated by the upper cylinder gear by the actuator 17-18 by introducing between the latter and the lever 6 of the vibrator mechanism to be lifted a motiontransmitting connection here in the form of a chock. In the present example there is a weighted bell-crank lever 22, tulcrumed on a shaft 23 in bracket 21 and having one arm depending and carrying the chock, which is a thin plate 24 thickened up at its lower edge to form the chock proper 24, being pivotally connected as at 25, Fig. 4) to said arm of the lever. The checks alternate with the levers 6 and their portions 242L underlie them. Then any chock is moved to the left at a time when actuator' 17-18 is down, so that it becomes interposed between the latter and the corresponding lever 6, the latter will be raised on the next ensuing rise of the actuator. This movement is elfected from the rising grid 26 of the jacquard machine of the loom by one of the hooks 27 thereof, each hook having a suitable connection with a lever 22, as the cords or wires 28-29 and interposed lever 30.

Operation: When any vibrator mechanism is made to change position, up or down, its

vibrator gear is turned a artial revolution bY the cylinder gear approached (shifting the boxes) and comes to a dwell, as usual, remaining at dwell till the position of said mechanism is again changed. As usual, also, on every revolution of the cylinder gears the pawl remains in locking relation to lever 6 during the working portion of the cycle of such gears, but is cammed away by cam 13 during the idle portion of the cycle. Gravity normally holds each vibrator mechanism depressed or in operative relation to the lower cylinder gear. It is elevated into operativev relation to the upper cylinder gear by call from its hook 27, resulting in interposing the corresponding chock between the actuator 17-18 and lever 6. When any vibrator mechanism is in operative relation to the -lower cylinder gear it stands stationary whatever number of revolutions the cylinder gears undergo before said mechanism is again shifted. But when it is raisedso as to'be actuated'by the upper cylinder Ygear it stands elevated only while the toothed portions of the cylinder gears are passing through the active parts of their cycle (i. e., when vthey adjoin the vibrator mechanism), being allowed to fall and (if required again to be elevated) raised again by the actuator 17-18 during the ensuing idle part of such cycle; that is to say, the toothed port-ions of the cylinder gears havingpassed and pawl l2 having cleared lever 6, the actuator is down, so that said mechanism falls to the depressed position, being raised again by the action of cam 16 on the actuator before said toothed portions again approach.

The pivoting yof impact memberl8 to lever 17 and rectilineal guiding thereof and the pivoting of chock 24 to its carrier formed by lever 22 insures proper mechanical and etlicient coaction of the part-s.

With my improvement the loom can be reversed or picked back and there will be a corresponding setting back in respect to the pattern so far as it depends on the movements of the shuttle boxes, which is not true where a dobby or indicator is used and which, since it would otherwise continue vto progress, requires to be individually set back by the weaver whenever the loom is reversed. Further, my improvement avoids any possibility of the pattern developed by the movements of the shuttle boxes falling behind through any failure of the means to cause elevation at any time of the Vibrator mechanism to work.

Having thus fully described my invention, what I claim is: l

l. A shuttle-box motion of the class described comprising a fulcrumed vibrator mechanism movable to either of two positions and normally held in one of them, an actuating means including a back-and-forthmov ing lever, an impact member pivoted to the lever, means to guide the impact member substantially rectilineally, ay motion-transmitting connection movable into and out of connecting relation to said mechanism and member, and means to control the movement of said connection.

2. A shuttle-box motion of the class described comprising a 'fulcrumed vibrator 

